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Synchronous Input/output Interprocess Communication , example does not work

Mhawley1

Don't know if anybody has been using the Cadence Help Document version 02.30-p006 but I cant for the life of get this example working .

There is this section In Cadence Interprocess Communication SKILL Reference where Skill and a C program talk to each other.

They use the example below for the C program and compile it with the name Upper.exe

#include <stdio.h>
#define bufflen 4096
int main(int argc, char* argv[]) 
{
    char buff[bufflen];

    while (1) {
        gets(buff);
        {   int i;
            for(i=0; i < strlen(buff); i++)
                buff[i] = toupper(buff[i]);
        }
        printf(buff);
        fflush(stdio);
    }
}

The SKILL program  is as follows .

cid = ipcBeginProcess( "upper.exe" )
ipcWriteProcess( cid "hello\n" )
x = ipcReadProcess( cid 20 ) 
when(x printf(" New string : %s", x ))
ipcKillProcess( cid ) ;; Kill Or send another string

 

I had to modify the C program so it would even compile . Some of the include libraries were missing and the Flush command didn't look right .

#include <stdio.h>
#include <string.h>
#include <ctype.h>
#define bufflen 4096
int main(int argc, char argv[])
{
    char buff[bufflen];

    while (1) {
        gets(buff);
        {   int i;
            for(i=0; i < strlen(buff); i++)
                buff[i] = toupper(buff[i]);
        }
        printf(buff);
        fflush(stdout);
    }
}

The Skill code I modified just a little bit so it pointed exactly to my file and was wrapped in a procedure.

note the directory is just something I made up for example .

procedure(serial_run()
cid = ipcBeginProcess( "G://folder//folder//folder//folder//upper.exe" "" 'myIpcDataHandler 'myIpcErrHandler 'myIpcFinishHandler "/tmp/ipc.log")
ipcWriteProcess( cid "hello\n" )
x = ipcReadProcess( cid 1 )
when(x printf(" New string : %s", x ))
ipcKillProcess( cid ) ;; Kill Or send another string
)

So I get the executable to run once I put in the command serial_run but then it just sits there, no repsonse . If nobody spots any obviouse problems can someone give me the simplest example of Interprocess Communication that works?

  • I got your example to work on my Win8.1 laptop with SPB16.6, below is an example session:

    C:\Users\davidh\Documents>cat upper.c
    #include <stdio.h>
    #include <string.h>
    #include <ctype.h>
    #define bufflen 4096
    int main(int argc, char* argv[])
    {
    char buff[bufflen];

    while (1) {
    gets(buff);
    { int i;
    for(i=0; i < strlen(buff); i++)
    buff[i] = toupper(buff[i]);
    }
    printf(buff);
    fflush(stdout);
    }
    }

    C:\Users\davidh\Documents>cat upper.ils
    procedure(serial_run()
    let((cid x)
    (cid = ipcBeginProcess( "C:/Users/davidh/Documents/upper.exe" "" 'myIpcDataHandler 'myIpcErrHandler 'myIpcFinishHandler "C:/temp/ipc.log"))
    ipcWriteProcess(cid "hello\n")
    (x = ipcReadProcess(cid 1))
    when(x printf(" New string : %s\n",x))
    ipcKillProcess(cid) ;; Kill Or send another string
    )
    )

    C:\Users\davidh\Documents>il_allegro
    > sklint(?file "upper.ils")
    Loading skillLint.cxt
    INFO (LoadFile): Loading file D:\Cadence\SPB_16.6\tools\sklint/rules/allegro_sklint.il...
    INFO (LoadFile): Loading file D:\Cadence\SPB_16.6\tools\sklint/rules/dd.il...
    INFO (LoadFile): Loading file D:\Cadence\SPB_16.6\tools\sklint/rules/dm.il...
    INFO (LoadFile): Loading file D:\Cadence\SPB_16.6\tools\sklint/rules/dmBase.il...
    INFO (LoadFile): Loading file D:\Cadence\SPB_16.6\tools\sklint/rules/dmUser.il...
    INFO (LoadFile): Loading file D:\Cadence\SPB_16.6\tools\sklint/rules/hi2ipc.il...
    INFO (LoadFile): Loading file D:\Cadence\SPB_16.6\tools\sklint/rules/ignore.il...
    INFO (LoadFile): Loading file D:\Cadence\SPB_16.6\tools\sklint/rules/ilMig.il...
    INFO (REP008): Program SKILL Lint started on Sep 09 10:35:33 2020.
    INFO (PREFIXES): Using prefixes: "none"
    INFO (STRICT): Using strict checking of global variables.
    INFO (IQ): IQ score is 100 (best is 100).
    INFO (IQ1): IQ score is based on 0 error messages, 0 general warning messages, and 1 top level forms.
    INFO (REP110): Total enhancement : 0.
    INFO (REP110): Total external global : 0.
    INFO (REP110): Total package global : 0.
    INFO (REP110): Total warning global : 0.
    INFO (REP110): Total error global : 0.
    INFO (REP110): Total unused vars : 0.
    INFO (REP110): Total next release : 0.
    INFO (REP110): Total alert : 0.
    INFO (REP110): Total hint : 0.
    INFO (REP110): Total suggestion : 0.
    INFO (REP110): Total internal alert : 0.
    INFO (REP110): Total information : 24.
    INFO (REP110): Total warning : 0.
    INFO (REP110): Total error : 0.
    INFO (REP110): Total internal error : 0.
    INFO (REP110): Total fatal error : 0.
    INFO (REP009): Program SKILL Lint finished on Sep 09 10:35:33 2020 with status PASS.
    t
    > (load "upper.ils")
    t
    > (serial_run)
    New string : HELLO
    t
    > exit

    C:\Users\davidh\Documents>

  • in reply to DavidJHutchins

    Thank you David for testing it

    I did find out what the problem was eventually  ! There was nothing wrong with the code the whole time . I found out that if you put the Executable on a drive letter ( a company one ) far far away it cannot acces it in time . I guess it timed out .

    With that baby step done . I can now pass in large masses or strings for manipulation ….

    * backstory* I want to make a silkscreen generator . BRD file passes Silkscreen and part extent data to C program . C program spits out "ideal" Silkscreen position data …

    No idea what kind of algorithm would do that , but should be fun figuring it out . Smiley

  • in reply to Mhawley1

    When I worked at Intel as a CAD Engineer I found that using the full UNC pathnames was better than using the mapped drive names in the tools I developed for them...

    Is your C program going to include pad & via locations, since silkscreen on exposed copper creates solder reflow issues ( so I was told in a previous life... )?

  • in reply to DavidJHutchins

    I should have responded to this sooner , I didn't think of that but your right I would need to report those geometries as well . Then I thought of another problem , sometimes you just cant fit the whole group of test and you need to put it off somewhere else in the board with a leader line . ( think I saw that done on my xbox motherboard once) 

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